Re: [amsat-bb] GRRRRRRRRRRR!

[Jon Ogden <na9d@xxxxxxxxxxxxxx>]

on 3/6/01 9:30 AM, Howard Long at howard@howardlong.com wrote:

> OK I give up... educate me! If the antennas on the ground are pointing
> directly at the satellite, why is the polarization any different to having
> the elements on the same boom? ie circular rather than eliptical?

Because when the elements are on the same boom, the RF field vector that is
rotating in CP rotates around the axis of the boom.  However, in a case
where the antennas are physically separated, the RF field vector will have a
shift to it in the direction of the other antenna.  Therefore, pattern
distortion will develop since the field vector's axis of rotation ends up
being skewed.  That's really the best way I can think to put it.

In practical use does it make any difference?  At 2m and 432, probably not.
If you did the same with S-band and had the same spacing it may since S-band
is a much smaller wavelength.

73,

Jon
NA9D

-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)

Member:  ARRL, AMSAT, DXCC, NRA

http://www.qsl.net/ke9na

"A life lived in fear is a life half lived."

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